Doorbell



FIG. 1 is a front perspective view of a doorbell showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions of the design shown in dashed lines are for the purpose of illustrating environment only and form no part of the claimed design.

The dot-dash lines in FIGS. 1-5 are boundary lines that define the bounds of the claimed design at a top portion of the doorbell and form no part thereof. 

CLAIM The ornamental design for a doorbell, as shown and described. 